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This unique manual impact driver converts hammer strike into powerful torque force, to loosen stubborn or rusty screws or tighten critical screws. Also works well on nuts bolts and other fasteners(requires proper 1/2"" sockets). Widely use in home improvement, auto, machine, repairment and more... Advanced Heavy Duty Impact Driver ① Reversible Impact Driver supports to tighten or loosen target screws, even rusty, invalid or stubborn fasteners. ② Fits most 1/2"" impact sockets so you could use this manual impact driver on nuts, bolts, and other fasteners. ③ Heavy duty integrated steel body with larger and thicker bottom to bear large impact force. ④ Equiped with Non-slip Protective Shell to help you hold the driver firmly and prevent accident hurt to hands. Superior S2 Screwdriver Bits ① Comes with 6Pcs Superior S2 Screwdriver Bits, 2 Flats(longe SL8, short SL8) and 4 Phillips(lone PH1, PH2, PH3, short SL8). ② S2 steel reachs superior hardness( hardness HRC58-62) by high temp quench, much harder than CR-V steel (hardness HRC48-52). These S2 screwdriver bits stand larger impact force and twisting force, prevents screw slide or abrasion, and no more twisty or broke bits. Package Includes: 1x 1/2"" Reversible Impact Driver 1x 1/2""Drive Bit Chuck(Coupler Adapter) 1x Storage Case 1x Long PH1 Bit 1x Long PH2 Bit 1x Long PH3 Bit 1x Long SL8 Bit 1x Short PH2 Bit 1x Short SL8 Bit How to Use Press and turn the chuck towards ""L""(loosening) or ""R""(tightening). Pick a proper screwdriver bit and assemble it on drive bit chuck. Hold impact driver perpendicular as possible to targe screws. Strike hard and fast with a heavy hammer, impact force will be converted into powerful torque force, to loosen or tighten target screws.